/**
*     Copyright (c) 2022, Nations Technologies Inc.
* 
*     All rights reserved.
*
*     This software is the exclusive property of Nations Technologies Inc. (Hereinafter 
* referred to as NATIONS). This software, and the product of NATIONS described herein 
* (Hereinafter referred to as the Product) are owned by NATIONS under the laws and treaties
* of the People’s Republic of China and other applicable jurisdictions worldwide.
*
*     NATIONS does not grant any license under its patents, copyrights, trademarks, or other 
* intellectual property rights. Names and brands of third party may be mentioned or referred 
* thereto (if any) for identification purposes only.
*
*     NATIONS reserves the right to make changes, corrections, enhancements, modifications, and 
* improvements to this software at any time without notice. Please contact NATIONS and obtain 
* the latest version of this software before placing orders.

*     Although NATIONS has attempted to provide accurate and reliable information, NATIONS assumes 
* no responsibility for the accuracy and reliability of this software.
* 
*     It is the responsibility of the user of this software to properly design, program, and test 
* the functionality and safety of any application made of this information and any resulting product. 
* In no event shall NATIONS be liable for any direct, indirect, incidental, special,exemplary, or 
* consequential damages arising in any way out of the use of this software or the Product.
*
*     NATIONS Products are neither intended nor warranted for usage in systems or equipment, any
* malfunction or failure of which may cause loss of human life, bodily injury or severe property 
* damage. Such applications are deemed, “Insecure Usage”.
*
*     All Insecure Usage shall be made at user’s risk. User shall indemnify NATIONS and hold NATIONS 
* harmless from and against all claims, costs, damages, and other liabilities, arising from or related 
* to any customer’s Insecure Usage.

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* limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement
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*
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* whose manufacture, use, or sale is prohibited under any applicable domestic or foreign laws or regulations. 
* User shall comply with any applicable export control laws and regulations promulgated and administered by 
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**/

/**
*\*\file bsp_delay.c
*\*\author Nations
*\*\version v1.0.0
*\*\copyright Copyright (c) 2022, Nations Technologies Inc. All rights reserved.
**/


#include "bsp_delay.h"

/**
 *\*\name    DBG_SysTick_Config.
 *\*\fun     System tick configuration.
 *\*\param   ticks :system tick
 *\*\return  none
**/
static uint32_t DBG_SysTick_Config(uint32_t ticks)
{ 
    if (ticks > SysTick_LOAD_RELOAD_Msk)  return (1);            /* Reload value impossible */
                                                               
    SysTick->LOAD  = (ticks & SysTick_LOAD_RELOAD_Msk) - 1;      /* set reload register */
    NVIC_SetPriority (SysTick_IRQn, (1<<__NVIC_PRIO_BITS) - 1);  /* set Priority for Cortex-M0 System Interrupts */
    SysTick->VAL   = 0;                                          /* Load the SysTick Counter Value */
    SysTick->CTRL  = SysTick_CTRL_CLKSOURCE_Msk | 
                     SysTick_CTRL_ENABLE_Msk;                    /* Enable SysTick IRQ and SysTick Timer */
    SysTick->CTRL  &= ~SysTick_CTRL_TICKINT_Msk;
    return (0);                                                  /* Function successful */
}

/**
 *\*\name    SysTick_Delay_Us.
 *\*\fun     microsecond delay.
 *\*\param   us :any number
 *\*\return  none
**/
void SysTick_Delay_Us( __IO uint32_t us)
{
    uint32_t i;
    RCC_ClocksType RCC_Clocks;

    RCC_Clocks_Frequencies_Value_Get(&RCC_Clocks);
    DBG_SysTick_Config(RCC_Clocks.SysclkFreq / 1000000);

    for(i=0;i<us;i++)
    {
        /* When the counter value decreases to 0, bit 16 of the CRTL register will be set to 1 */
        /* When set to 1, reading this bit will clear it to 0 */
        while( !((SysTick->CTRL)&(1<<16)) );
    }
    /* Turn off the SysTick timer */
    SysTick->CTRL &=~ SysTick_CTRL_ENABLE_Msk;
    }

/**
 *\*\name    SysTick_Delay_Us.
 *\*\fun     millisecond delay.
 *\*\param   ms :any number
 *\*\return  none
**/
void SysTick_Delay_Ms( __IO uint32_t ms)
{
    uint32_t i;
    RCC_ClocksType RCC_Clocks;
    
    RCC_Clocks_Frequencies_Value_Get(&RCC_Clocks);
    DBG_SysTick_Config(RCC_Clocks.SysclkFreq / 1000);

    for(i=0;i<ms;i++)
    {
        /* When the counter value decreases to 0, bit 16 of the CRTL register will be set to 1 */
        /* When set to 1, reading this bit will clear it to 0 */
        while( !((SysTick->CTRL)&(1<<16)) );
    }
    /* Turn off the SysTick timer */
    SysTick->CTRL &=~ SysTick_CTRL_ENABLE_Msk;
}